高温材料光谱发射率测量实验研究

发布时间：2018-05-12 07:41

  本文选题：光谱发射率 + 高温　； 参考：《长春理工大学》2017年硕士论文

【摘要】：材料的高温光谱发射率为材料最重要的高温热物性参量之一,是影响高温条件下物体热辐射能力和它的光谱分布、物体之间热辐射交换量的主要参数,在航空航天、辐射测温、能源与节能、国防等领域存在迫切的需求。本文研究了包括背景辐射、黑体有效发射率、黑体温度、样片外推温降的高温发射率测量理论模型。建立了一个基于积分黑体方法测量高温材料的光谱发射率的测量系统。该系统的实现基于一个优化温场的高温变温黑体辐射源,高温样品坩埚、高速气动活塞直线驱动装置,线性高温计和光纤光谱仪、以及同步电路。开展复杂传热边界条件下,高温样品在高速直线位移过程中的温度动态变化数值模拟,提出了将加热管离散化为若干等温圆柱环,同时基于辐射换热网络模拟温度衰减特性的方法。实验研究了石墨材料样品在1000℃、1300℃和1500℃高温下的光谱发射率特性,验证了本文建立的测量装置及测量方法的有效性。
[Abstract]:The high temperature spectral emissivity of the material is one of the most important parameters of the material's thermal properties at high temperature. It affects the thermal radiation capacity of the object and its spectral distribution at high temperature, the main parameters of the heat radiation exchange amount between the objects, and the measurement of the radiation temperature in aerospace, radiation and temperature measurement. Energy and energy conservation, national defense and other areas of urgent demand. In this paper, a theoretical model of high temperature emissivity measurement including background radiation, blackbody effective emissivity, blackbody temperature and sample extrapolation temperature drop is studied. A system for measuring spectral emissivity of high temperature materials based on integral blackbody method is established. The realization of the system is based on a blackbody radiation source with optimized temperature field, a high temperature sample crucible, a high-speed pneumatic piston linear drive device, a linear pyrometer and optical fiber spectrometer, and a synchronous circuit. The numerical simulation of temperature dynamic change of high temperature samples during high speed linear displacement under complex heat transfer boundary conditions is carried out, and the discretization of heating tubes into isothermal cylindrical rings is proposed. At the same time, the method of simulating temperature attenuation based on radiative heat transfer network is presented. The spectral emissivity characteristics of graphite samples at 1000 鈩，

本文编号：1877735